A shear wall structure

Abstract

The present invention discloses a shear wall structure, including a foundation and a shear wall arranged on the foundation, reserved spaces are symmetrically arranged on both sides of the bottom where the shear wall is connected to the foundation, and a deformation amplification type energy dissipator is arranged in each reserved space; the deformation amplification type energy dissipator includes a first connection part, a second connection part and a third connection part; a middle hinge point is arranged on the second connection part to divide the second connection part into a power arm and a resistance arm in the length direction; the second connection part is connected to the upper end of the first connection part through the middle hinge point; an outer buckling restraint type energy dissipation component connected to the first connection part is arranged at the end of the power arm of the second connection part, and an inner buckling restraint type energy dissipation component connected to the third connection part is arranged at the end of the resistance arm of the second connection part. The present invention amplifies the deformation of the inner energy dissipation component through the principle of lever, and can freely combine various types of dampers, overcome the disadvantage that the inner deformation of the shear wall under horizontal load is small and the energy dissipation capacity of the damper cannot be fully utilized, and improve the energy dissipation capacity of the failed part of the shear wall.

Description

Technical Field

[0001] The invention belongs to the field of building structures, and in particular relates to a shear wall structure. Background Art

[0002] As an important earthquake-resistant structural system, cast-in-place reinforced concrete shear wall structures have been widely used at home and abroad. According to previous earthquake damage surveys at home and abroad, compared with frame structures, shear wall structural systems have large lateral stiffness and high earthquake bearing capacity. However, under strong earthquakes, shear walls designed according to the bending failure mode are often easy to collapse the concrete at the foot, and the compressed steel bars yield, making it difficult to repair and reinforce the structure. The earthquake damage to cast-in-place reinforced concrete shear wall structures in the 2008 Wenchuan 8.0 earthquake and the 2010 Chile 8.8 earthquake also showed that most shear wall feet were damaged to a large extent, which brought great difficulties to the post-earthquake repair work.

[0003] The current seismic fortification goal has gradually evolved from the consideration of "strong earthquake resistance" and the protection of people's lives to the rapid restoration of urban functions and normal life order of residents after the earthquake. By setting replaceable energy dissipators in the structure, when the structure is subjected to strong horizontal forces, the damaged parts are mainly concentrated at the replaceable energy dissipators, which can not only utilize their excellent energy dissipation performance, but also facilitate the rapid replacement of damaged parts and restore the normal use function of the structure as soon as possible.

[0004] In the prior art, the displacement generated at the beam-column node in the frame structure under the action of external loads is relatively small, and the energy dissipation characteristics of the damper are not fully utilized. Researchers have proposed rotational amplification node shear dampers, amplified displacement shape memory alloy dampers, etc., but amplified displacement energy dissipators are rarely used in shear wall structures. Under the action of external forces, earthquakes or wind loads, since shear walls often show bending damage, according to the flat section assumption, the deformation of the edge area of ​​the shear wall is the largest, and the deformation gradually decreases as it gets closer to the neutral axis. The prior art sets various energy dissipators at the feet, such as viscous dampers, friction energy dissipators, metal energy dissipators, soft steel rubber bearings, etc., which fail to take into account the impact of uneven deformation. When the deformation is small, the energy dissipation performance is often poor.

[0005] In view of this, it is necessary to develop an energy dissipator suitable for reinforced concrete shear walls to overcome some defects of the existing technology. Under a small displacement of the shear wall, the deformation of the energy dissipator can be multiplied to achieve a more ideal energy dissipation effect. It can fully utilize the energy dissipator to effectively dissipate the energy input into the structure by horizontal earthquakes, and at the same time meet the requirements of simple structure, economic rationality, safety and reliability, and easy replacement after damage. Summary of the invention

[0006] To this end, the present invention proposes a shear wall structure. Through the principle of lever, the deformation of the inner energy-absorbing component is amplified, overcoming the disadvantage that the inner deformation of the shear wall under horizontal load is small and the energy-absorbing capacity of the damper cannot be fully utilized. At the same time, the energy dissipator can be used in combination with various types of dampers, which has strong applicability to improve the bearing capacity and energy-absorbing capacity of the failed part of the shear wall. The deformation-amplifying energy dissipator is detachably connected to the shear wall, which is easy to replace after an earthquake and can quickly restore the seismic function of the shear wall.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A shear wall structure comprises a foundation and a shear wall arranged on the foundation, characterized in that reserved spaces are symmetrically arranged on both sides of the bottom where the shear wall is connected to the foundation, and a deformation amplification type energy dissipator is arranged in each reserved space.

[0009] The deformable amplification type energy absorber includes a first connection part, a second connection part and a third connection part; the lower end of the first connection part is fixed to the foundation, and the third connection part is fixed to the upper bottom surface of the shear wall reserved space; a middle hinge point is arranged on the second connection part, which divides the second connection part into a power arm and a resistance arm in the length direction; the second connection part is connected to the upper end of the first connection part through the middle hinge point; an outer buckling restraint type energy absorption component connected to the first connection part is arranged at the end of the power arm of the second connection part, and an inner buckling restraint type energy absorption component connected to the third connection part is arranged at the end of the resistance arm of the second connection part; the upper end of the power arm of the second connection part is movably connected to the upper bottom surface of the shear wall reserved space to form a movable connection point.

[0010] The first connection part includes a base plate and a pin support and a fixed hinge support arranged on the base plate; the second connection part is hinged on the pin support; and the outer buckling restraint type energy-absorbing component is connected to the fixed hinge support.

[0011] The second connecting part includes a steel arm, a curvature adjustment node and a hinge support located at the end of the power arm in the steel arm, and a hinge support located at the end of the resistance arm in the steel arm; the curvature adjustment node is hinged on the upper bottom surface of the shear wall reserved space.

[0012] The third connection portion includes a top plate and a fixed hinge support arranged on the top plate, and the inner side buckling restrained energy absorbing component is connected to the fixed hinge support.

[0013] A first embedded part fixedly connected to the first connection part is arranged in the foundation; a second embedded part movably connected to the upper end of the power arm of the second connection part and a third embedded part fixedly connected to the third connection part are arranged in the reserved space of the shear wall.

[0014] The first embedded part is composed of a flat plate, a plurality of internally threaded sleeves and a plurality of foundation steel bars, and the bottom surface of the flat plate is welded to the internally threaded sleeves and the foundation steel bars.

[0015] The second embedded part is composed of a flat plate, three connecting plates and a plurality of shear wall steel bars. The top surface of the flat plate is welded to the shear wall steel bars, and the bottom surface of the flat plate is welded to the connecting plates.

[0016] The third embedded part is composed of a flat plate, a plurality of internally threaded sleeves and a plurality of shear wall steel bars, and the top surface of the flat plate is welded to the internally threaded sleeves and the shear wall steel bars.

[0017] The present invention has the following beneficial effects:

[0018] The present invention uses the lever principle to amplify the deformation of the inner energy-absorbing component, thereby overcoming the disadvantage that the inner deformation of the shear wall under horizontal load is small and the energy-absorbing capacity of the damper cannot be fully utilized. The deformation amplification effect can be adjusted by adjusting the ratio of the power arm to the resistance arm, so that the energy dissipator can participate in energy dissipation under small earthquakes, thereby significantly improving the bearing capacity and energy dissipation capacity of the failed part of the shear wall.

[0019] The deformation amplification type energy dissipator proposed by the present invention can freely combine various types of dampers inside, and has strong applicability. Since the energy dissipation components on both the inner and outer sides of the energy dissipator are greatly deformed, metal, friction, viscosity and other dampers can be used as energy dissipation components, and can also be used in combination.

[0020] Deformation-amplifying energy absorbers are connected to embedded parts through high-strength bolts and pins, which is convenient for assembly; when the energy absorber is damaged under the action of a strong earthquake, it is only necessary to rotate the high-strength bolts and pins out and replace them with new ones, which is conducive to quickly restoring the shear wall function after damage; the plastic deformation is concentrated in the area of ​​replaceable components, and other parts of the structure still maintain elasticity, reducing the repair work after damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of shear wall structure with deformation-enhancing energy dissipators at the foot;

[0022] Figure 2 Partial schematic diagram of shear wall structure with deformation-enhancing energy dissipators at the foot;

[0023] Figure 3 Schematic diagram of the structure of the deformation-enlarged energy dissipator;

[0024] Figure 4 A schematic structural diagram of a first embedded part;

[0025] Figure 5 A schematic structural diagram of a second embedded part;

[0026] Figure 6 A schematic diagram of the structure of the third embedded part;

[0027] Figure 7 A schematic structural diagram of the first connecting portion;

[0028] Figure 8 A schematic structural diagram of the second connecting portion;

[0029] Fig. 9 A schematic structural diagram of the third connecting portion;

[0030] Fig.10 Schematic diagram of the connection between the deformation enlarged energy dissipator and the embedded parts;

[0031] Fig.11 Schematic diagram of the structure of the buckling restrained energy dissipation rod;

[0032] Fig.12 Schematic diagram of setting the connection of the buckling restrained energy dissipation plate;

[0033] Fig.13 Schematic diagram of the structure of the buckling restrained energy dissipation plate;

[0034] Fig.14 A schematic diagram of the structure of a deformable enlarged energy dissipator with three sets of energy dissipation components;

[0035] Fig.15 A schematic diagram of the deformation of a shear wall structure with a deformation-enhancing energy dissipator at the foot according to an embodiment of the present invention;

[0036] Fig.16 Finite element model and hysteresis curve of a deformation-enlarged energy dissipator according to an embodiment of the present invention.

[0037] In the figure: 1, foundation; 2, shear wall; 3, deformation amplification type energy dissipator; 31, first connection; 311, bottom plate; 312, pin support; 313, fixed hinge support; 3131, end plate; 3132, rib plate; 3133, steel rod; 32, second connection; 321, steel arm; 3211, steel beam; 3212, longitudinal stiffening plate; 3213, transverse stiffening plate; 3214, ear plate; 322, curvature adjustment node; 3221, connecting plate; 323, hinge support; 3231, steel rod; 3232, rib plate; 324, hinge support; 3241, steel rod; 3242, rib plate; 33, third connection; 331, top plate; 332, fixed hinge support; 3321, end plate; 3322, rib plate; 332 3. Steel rod; 4. First embedded part; 41. Flat plate; 42. Internally threaded sleeve; 43. Foundation steel bar; 5. Second embedded part; 51. Flat plate; 52. Connecting plate; 53. Shear wall steel bar; 6. Third embedded part; 61. Flat plate; 62. Internally threaded sleeve; 63. Shear wall steel bar; 7. First pin; 8. Second pin; 9. Outer buckling restrained energy absorbing component; 10. Inner buckling restrained energy absorbing component; 11. High-strength bolt; 12. Buckling restrained energy absorbing rod; 121. Spherical node; 122. Low yield point core rod; 123. Circular tubular restraint sleeve; 124. Filling material; 13. Buckling restrained energy absorbing plate; 131. Tubular node; 132 Low yield point core plate; 133. Rectangular restraint sleeve; 134. Filling material. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings:

[0039] The shear wall structure of the present invention comprises a foundation 1 and a shear wall 2 arranged on the foundation, wherein the shear wall 2 is symmetrically provided with reserved spaces on both sides of the bottom where the shear wall 2 is connected to the foundation 1, and a deformable enlarged energy dissipator 3 is installed in each reserved space. The deformable enlarged energy dissipator 3 is installed at the reserved space at the foot of the shear wall 2, connected to the second embedded part 5 through the pin 7, and respectively connected to the internal threaded sleeve 42 of the first embedded part 4 and the internal threaded sleeve 62 of the third embedded part 6 through the high-strength bolt 11, which is convenient for assembly and is conducive to the rapid replacement of the entire energy dissipator after damage.

[0040] The deformation-enhancing energy dissipator includes a first connection part 31, a second connection part 32 and a third connection part 33. The lower end of the first connection part 31 is fixed on the foundation 1; the third connection part 33 is fixed on the upper bottom surface of the reserved space of the shear wall 2; a middle hinge point is arranged on the second connection part 32, which divides the second connection part 32 into a resistance arm and a power arm in the length direction. The second connection part 32 is connected to the upper end of the first connection part 31 through the middle hinge point; an outer buckling restraint type energy dissipation component 9 connected to the first connection part 31 is arranged at the end of the power arm of the second connection part 32, and an inner buckling restraint type energy dissipation component 10 connected to the third connection part 33 is arranged at the end of the resistance arm of the second connection part 32; the upper end of the power arm of the second connection part 32 is movably connected to the upper bottom surface of the reserved space of the shear wall 2 to form a movable connection point.

[0041] The second connecting part 32 includes a steel arm 321, a curvature adjustment node 322 and a hinge support 323 at one end of the steel arm 321, and a hinge support 324 at the other end of the steel arm. The curvature adjustment node 322 is hinged to the second embedded part 5. The steel arm 321 is composed of two square steel beams 3211, a longitudinal stiffening plate 3212, a plurality of transverse stiffening plates 3213 and two ear plates 3214. The two square steel beams 3211 and the longitudinal stiffening ribs 3212 are connected by a plurality of transverse stiffening ribs 3213, and the two ear plates 3214 are respectively arranged at the lower part of the two steel beams 3211, and holes are opened on the ear plates.

[0042] The curvature adjustment node 322 is composed of a plurality of connecting plates 3221, on which oblique connecting holes are opened, and the connecting plates 3221 are connected to the connecting plates 51 of the second embedded parts 5 through the second pins 8. Through the connecting holes, the rotational curvatures of the shear wall 2 and the steel arm 321 are adjusted so that their deformations can be coordinated with each other.

[0043] The two ends of the steel arm 321 are also welded with ribs 3232 and 3242 with grooves. When the steel arm 321 is connected to the energy consuming components 9 and 10, the connection nodes of the energy consuming components 9 and 10 are first inserted into the steel rods 3231 and 3241 respectively, and then placed together in the grooves of the ribs 3232 and 3242, and then the steel rods 3231 and 3241 are fixed to the steel arm 321 by welding, and the connection between the steel rods 3231 and 3241 and the ribs 3232 and 3242 is also welded to strengthen the strength of the steel rods 3231 and 3241, but it is necessary to ensure that the connection nodes of the energy consuming components 9 and 10 can rotate around the steel rods 3231 and 3241.

[0044] The upper part of the pin support 312 is hinged to the ear plate 3214 of the steel arm 321 through the first pin 7, and the lower part is welded and fixed to the bottom plate 311. According to the principle of lever, the distance from the fulcrum to the line of action of the power is the power arm, and the distance from the fulcrum to the line of action of the resistance is the resistance arm; in this embodiment, the fulcrum is the pin connection node between the pin support 312 and the steel arm 321, and its position should be determined according to the degree of deformation amplification to be set for the inner energy-absorbing component 10. In addition, a certain spatial distance must be maintained between the end of the resistance arm and the top surface of the foundation 1 to prevent the end of the resistance arm from colliding with the foundation 1 when moving downward and limiting the rotational displacement of the steel arm 321. The specific value of this distance is determined according to the maximum displacement of the inner end of the steel arm 321 moving downward under the shear wall's large earthquake protection target.

[0045] A fixed hinge support 313 is also welded to the top surface of the bottom plate 311 of the first connecting part 31. The fixed hinge support 313 is composed of two end plates 3131, a rib plate 3132 and a steel rod 3133. The end plates 3131 are respectively arranged at both ends of the rib plate 3132. The rib plate 3132 is provided with a groove. The lower connection node of the outer energy-absorbing component 9 is inserted into the steel rod 3133, and then placed together in the groove of the rib plate 3132. Then the steel rod 3133 is fixed to the end plate 3131 by welding. At the same time, welding is performed at the connection between the steel rod 3133 and the rib plate 3132 to strengthen the strength of the steel rod 3133, but it is necessary to ensure that the connection node of the energy-absorbing component can rotate around the steel rod 3133.

[0046] A fixed hinge support 332 is welded to the bottom surface of the top plate 331 of the third connecting part 33. The fixed hinge support 332 is composed of two end plates 3321, a rib plate 3322 and a steel rod 3323. The end plates 3321 are respectively arranged at both ends of the rib plate 3322. The rib plate 3322 is provided with a groove. The upper connection node of the inner energy-absorbing component 10 is inserted into the steel rod 3323, and then placed together in the groove of the rib plate 3322. Then the steel rod 3323 is fixed to the end plate 3321 by welding. At the same time, welding is performed at the connection between the steel rod 3323 and the rib plate 3322 to strengthen the strength of the steel rod 3323, but it is necessary to ensure that the connection node of the energy-absorbing component can rotate around the steel rod 3323.

[0047] The energy-absorbing components 9 and 10 are respectively installed at the two ends of the steel arm 321, wherein the upper end of the outer energy-absorbing component 9 is hinged to the power arm, and the lower end is hinged to the first connecting part 31 through a fixed hinge support; the upper end of the inner energy-absorbing component 10 is hinged to the third connecting part 33 through a fixed hinge support, and the lower end is hinged to the resistance arm.

[0048] The energy dissipation components 9 and 10 may be composed of a plurality of buckling restrained energy dissipation rods 12, which are composed of a spherical node 121, a low yield point core rod 122, a tubular restraint sleeve 123 and a filling material 124. The tubular restraint sleeve 123 has a cross-sectional shape of a circular tube, the low yield point core rod 122 is placed in the tubular restraint sleeve 123, and then the filling material 124 is added. In order to guide the failure mode of the energy dissipation rod to be concentrated in the middle, the connecting section between the spherical node 121 and the low yield point core rod 122 is strengthened, and a plurality of small holes are opened in the middle of the low yield point core rod 122 to weaken it.

[0049] The energy dissipation component can also be composed of a buckling restrained energy dissipation plate 13, which is composed of a tubular node 131, a low yield point core plate 132, a rectangular restraint sleeve 133 and a filling material 134. The rectangular restraint sleeve 133 is composed of a rectangular steel tube and a plurality of ribs, the ribs are welded to the inner side of the rectangular steel tube, the low yield point core plate 132 is placed in the rectangular restraint sleeve 133, and then the filling material 134 is added. In order to guide the failure mode of the energy dissipation plate to be concentrated in the middle, the cross section where the tubular node 131 and the low yield point core plate 132 are connected is strengthened, and at the same time, a plurality of long slot-shaped holes are opened in the middle of the low yield point core plate 132 to weaken it.

[0050] As another implementation method, in order to further exert the energy dissipation capacity of the deformation amplification type energy dissipator, a group of energy dissipation components can be added at the lower part of the end of the resistance arm. Then the inner energy dissipation components can be divided into two groups, the upper end of the upper energy dissipation component is hinged to the third connecting part 33, and the lower end is hinged to the resistance arm; the upper end of the lower energy dissipation component is hinged to the resistance arm, and the lower end is hinged to the first link 31.

[0051] Structural deformation such as Fig.15 As shown in the figure, assuming that the shear wall 2 deforms under the horizontal load, and the rotation curvature is θ, then according to the plane section assumption, the vertical deformation of the edge of the shear wall 2 is Δ≈θ×L, where L is the distance from the neutral axis of the shear wall 2 to the edge. The shear wall 2 transmits the force to the end of the power arm through the second embedded part 5, and the power arm moves downward to compress the outer energy absorbing component 9, so the outer energy absorbing component 9 will also produce a deformation of about Δ. According to the principle of lever, it can be known that the steel arm 321 will drive the inner energy absorbing component 10 to produce a deformation of The upward deformation of the shear wall is shown in Figure 1, where A is the power arm length, i.e., the distance from the pin node of the steel arm 321 to the outer end of the steel arm, and B is the resistance arm length, i.e., the distance from the pin node of the steel arm 321 to the inner end of the steel arm 321. At the same time, due to the deformation of the shear wall, the force will be transmitted to the inner energy-absorbing component 10 through the third embedded part 6, causing it to generate where C is the distance from the neutral axis of the shear wall 2 to the inner energy absorbing component 10. In summary, when the edge of the shear wall 2 undergoes a vertical deformation Δ, the outer energy absorbing component 9 will also undergo a vertical deformation Δ, while the inner energy absorbing component 10 will undergo Compared with the outer energy-absorbing component 9, the deformation amplification effect of the inner energy-absorbing component 10 is times, and relative to the inner deformation of shear wall 2 The deformation amplification effect of the inner energy-absorbing component 10 is times.

[0052] Through finite element software, a refined numerical model of the energy dissipator is established ( Fig.16 ), and the interaction between the shear wall structure and the energy dissipator is considered as the boundary condition, and the quasi-static analysis under reciprocating load is carried out. The results show that under reciprocating load, the hysteresis curve of the energy dissipator is full, and it has excellent energy dissipation performance; and it starts to dissipate energy at a small deformation, that is, it can achieve energy dissipation under small earthquakes and protect the main structure from earthquake damage.

Claims

1. A shear wall structure, comprising a foundation and a shear wall arranged on the foundation, characterized in that: Reservation spaces are symmetrically arranged on both sides of the bottom where the shear wall is connected to the foundation, and a deformation-enhancing energy dissipator is arranged in each reserved space; The deformation-amplification type energy dissipator includes a first connection part, a second connection part and a third connection part; the lower end of the first connection part is fixed to the foundation, and the third connection part is fixed to the upper bottom surface of the reserved space of the shear wall; a middle hinge point is arranged on the second connection part, which divides the second connection part into a power arm and a resistance arm in the length direction; the second connection part is connected to the upper end of the first connection part through the middle hinge point; an outer buckling restraint type energy absorption component connected to the first connection part is arranged at the end of the power arm of the second connection part, and an inner buckling restraint type energy absorption component connected to the third connection part is arranged at the end of the resistance arm of the second connection part; the upper end of the power arm of the second connection part is movably connected to the upper bottom surface of the reserved space of the shear wall to form a movable connection point; The first connection part includes a bottom plate and a pin support and a fixed hinge support arranged on the bottom plate; the second connection part is hinged on the pin support; the outer buckling restrained energy absorbing component is connected to the fixed hinge support; The second connecting portion includes a steel arm, a curvature adjustment node and a hinge support located at one end of the steel arm, and a hinge support located at the other end of the steel arm; the curvature adjustment node is hinged on the upper bottom surface of the shear wall reserved space; The third connection portion includes a top plate and a fixed hinge support arranged on the top plate, and the inner side buckling restrained energy absorbing component is connected to the fixed hinge support.

2. The shear wall structure according to claim 1, characterized in that: A first embedded part fixedly connected to the first connection part is arranged in the foundation; a second embedded part movably connected to the upper end of the power arm of the second connection part and a third embedded part fixedly connected to the third connection part are arranged in the reserved space of the shear wall.

3. The shear wall structure according to claim 2, characterized in that: The first embedded part is composed of a flat plate, a plurality of internally threaded sleeves and a plurality of foundation steel bars, and the bottom surface of the flat plate is welded to the internally threaded sleeves and the foundation steel bars.

4. The shear wall structure according to claim 2, characterized in that: The second embedded part is composed of a flat plate, three connecting plates and a plurality of shear wall steel bars. The top surface of the flat plate is welded to the shear wall steel bars, and the bottom surface of the flat plate is welded to the connecting plates.

5. The shear wall structure according to claim 2, characterized in that: The third embedded part is composed of a flat plate, a plurality of internally threaded sleeves and a plurality of shear wall steel bars, and the top surface of the flat plate is welded to the internally threaded sleeves and the shear wall steel bars.

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